US7656098B2 - Brightness control apparatus of light bulb module - Google Patents
Brightness control apparatus of light bulb module Download PDFInfo
- Publication number
- US7656098B2 US7656098B2 US12/073,799 US7379908A US7656098B2 US 7656098 B2 US7656098 B2 US 7656098B2 US 7379908 A US7379908 A US 7379908A US 7656098 B2 US7656098 B2 US 7656098B2
- Authority
- US
- United States
- Prior art keywords
- light bulb
- circuit
- bulb module
- control apparatus
- brightness control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/185—Controlling the light source by remote control via power line carrier transmission
Definitions
- the present invention relates to an improved brightness control apparatus of a light bulb module, and more particularly to a brightness control apparatus that overcomes the shortcomings of a conventional control circuit by adding a signal receiving device and a failure protection device to the existing control circuit.
- the invention not only complies with the requirements of a product having a remote control light bulb module and maintains an even brightness for each light bulb of the light bulb module according to the brightness of the light bulb module adjusted by the remote control signal, but also keeps the total power consumption of the light bulb module in compliance with local laws and regulations for a total normal rated power of an illumination equipment.
- Another objective of the present invention is to install a failure protection circuit to the control circuit, so that if the control circuit of the light bulb module fails, each light bulb of the light bulb module remains lit.
- an improved brightness control apparatus comprising:
- a microcontroller having a power pin, a ground pin and a plurality of pins
- a capacitance step-down rectification circuit for converting an external alternate current (AC) into a direct current (DC), and supplying the direct current to an overall circuit system for its use;
- an output control circuit for receiving a control signal transmitted from the microcontroller, and controlling a total power consumption of the light bulb of the light bulb module; characterized in that
- a signal receiving circuit for receiving a phase angle of a received voltage and a current conduction status
- an amplification circuit includes a terminal electrically coupled to the output control circuit for detecting the total power consumption of the light bulb module, and another terminal electrically coupled to the microcontroller.
- FIG. 1 is a schematic circuit diagram of a control apparatus applied to a light bulb module having a plurality of light bulbs in accordance with the present invention.
- FIG. 1 a preferred embodiment is provided for illustrating the present invention, and it is noteworthy to point out that the preferred embodiment is provided for the purpose of illustration only, but not intended to limit the scope of the invention.
- a brightness control apparatus of a light bulb module comprises the following elements:
- a microcontroller 1 which is a microcontroller of Model No. PIC12F510 produced by Microchip Company in this embodiment, includes a power pin 11 , a first pin 12 , a second pin 13 , a third pin 14 , a fourth pin 15 , a fifth pin 16 , a sixth pin 17 and a ground pin 18 , and the second pin 13 is in a floating connection while it is not in use.
- a capacitance step-down rectification circuit 21 is equipped with a plurality of resistors, a plurality of capacitors, a plurality of diodes, a Zener diode, a surge absorber, a 5-volt regulator IC and a 12-volt regulator IC, for converting an external AC power supply 3 into a DC power, and supplying the DC power to the whole circuit system for its use, and the capacitance step-down rectification circuit 21 is electrically coupled to the power pin 11 of the microcontroller 1 .
- An output control circuit 22 is equipped with an AC gate, a plurality of resistors and a capacitor.
- the output control circuit 22 further includes a current output terminal 221 electrically coupled to the light bulb module 5 , and the output control circuit 22 is electrically coupled to the fourth pin 15 of the microcontroller 1 for receiving a control signal transmitted from the microcontroller 1 .
- a signal receiving circuit 23 is equipped with a plurality of resistors and electrically coupled to the third pin 14 and the fifth pin 16 of the microcontroller 1 , and the signal receiving circuit 23 is provided for receiving a phase angle of the voltage of the current circuit and a conduction status of the current input terminal 231 or the current output terminal 221 , and the current input terminal 231 is electrically coupled to two pins 211 of the power input terminal 3 of the capacitance step-down rectification circuit 21 .
- An amplification circuit 24 is equipped with an operational amplifier, a plurality of resistors and a plurality of capacitors. A terminal of the amplification circuit 24 is electrically coupled to the output control circuit 23 , and another terminal of the amplification circuit 24 is electrically coupled to the sixth pin 17 of the microcontroller 1 .
- a failure protection circuit 25 is equipped with a relay, a transistor, a diode and a resistor, such that if any circuit of the output control circuit 22 , the signal receiving circuit 23 or the amplification circuit 24 fails, the power input terminal 3 directly outputs power to the light bulb module 5 , and the failure protection circuit 25 is electrically coupled to the second pin 13 of the microcontroller 1 .
- the improvement resides on that the light bulb module 5 of the lamp includes three light bulbs 51 with the power of 70 W each, and users can install the brightness control apparatus of the invention to the lamp, so that the setup and control of the microcontroller 1 and the control of the aforementioned five control circuits can detect the quantity of light bulbs 51 of the light bulb module 5 and determine the voltage by the microcontroller 1 by the amplification circuit 24 , and maintain the power between the current input terminal 231 and the current output terminal 221 at a standard normal rated power below 190 watts.
- Each light bulb 51 of the light bulb module 5 emits light with an even brightness by 63 watt.
- the improved control circuit of the invention is connected to an external radio frequency remote control device by a BLUE-terminal 232 of the signal receiving circuit 23 for transmitting a radio frequency signal to the microcontroller 1 to control the brightness of the light bulbs 51 of the light bulb module 5 , while controlling the power below the standard normal rated power of 190 watts. If a L-terminal 233 of the signal receiving circuit is coupled to the current input terminal 231 , the cost for the required circuits will be lower, and the execution procedure and coding of the program for the microcontroller 1 will be simpler and easier.
- the failure protection circuit 25 of the improved control circuit is provided for outputting power directly from the power input terminal to the light bulb module through the failure protection circuit if any one of the output control circuit 22 , the signal receiving circuit 23 and the amplification circuit 24 fails, such that the light bulb module 5 remains lit, even if the control circuit fails.
- a lamp of this sort can maintain the required illumination without losing the overall aesthetic look of the lamp. Further, no change of the design is involved to comply with the total standard normal rated power for the illumination equipments, and thus the invention can save cost.
- the present invention has the advantage of maintaining an even brightness of each light bulb of the light bulb module by the control of the brightness control apparatus, so that the brightness of the bulbs of the light bulb module will not be too dark or not lit.
- the brightness control apparatus can operate with an external radio frequency remote control device to facilitate the control of brightness, and the failure protection circuit can maintain a temporary illumination effect and an overall aesthetic look of the lamp. If the brightness control circuit is operated normally, the total power consumption of the light bulbs of the light bulb module can meet the requirements of the standard normal rated power specified by local laws and regulations of the illumination equipments.
Abstract
An improved brightness control apparatus of a light bulb module replaces a portion of a conventional light bulb module brightness control apparatus by a signal receiving circuit, an amplification circuit and a failure protection circuit to maintain an even brightness of light emitted by each light bulb of the light bulb module of a lamp, so that the brightness of the light bulbs in the light bulb module will not be too dark or even not lit. The signal receiving circuit is provided for connecting an external remote control device for controlling the light bulb module. If the control circuit fails, the failure protection device can maintain a temporary illumination and an overall aesthetic look of the lamp. When the control circuit is operated normally, the total power consumption of the light bulbs of the light bulb module can comply with the normal rated standard of illumination equipments.
Description
1. Field of the Invention
The present invention relates to an improved brightness control apparatus of a light bulb module, and more particularly to a brightness control apparatus that overcomes the shortcomings of a conventional control circuit by adding a signal receiving device and a failure protection device to the existing control circuit. The invention not only complies with the requirements of a product having a remote control light bulb module and maintains an even brightness for each light bulb of the light bulb module according to the brightness of the light bulb module adjusted by the remote control signal, but also keeps the total power consumption of the light bulb module in compliance with local laws and regulations for a total normal rated power of an illumination equipment.
2. Description of the Related Art
In recent years, the issue of global energy crisis becomes increasingly serious, and countries propose different energy saving regulations and laws to cope with the insufficient supply to the demand of electric power. At present, the United States establishes related laws and regulations to limit the total normal rated power for indoor illumination equipments and request manufacturers to install a normal rated power breaker before shipping the illumination equipments to the market in order to maintain the total power consumption of the illumination equipments at a standard below the total normal rated power required by the government.
To comply with the foregoing requirements, related manufacturers have developed a brightness control apparatus for a light bulb module as disclosed in U.S. Pat. No. 7,301,290B1 that uses a microcontroller to determine whether or not an illumination equipment exceeds the total normal rated power of 190 W, and a breaker to disconnect the power of the control apparatus if the control circuit exceeds the normal rated power. If one of the control circuits in accordance with the aforementioned patented invention is burned, the whole illumination equipment cannot be used anymore. Users will find such application very inconvenient, or even dangerous if the breaker disconnects the illumination equipment during nighttime.
Therefore, it is an important subject for manufacturers and designers in the related industry to develop a circuit design capable of complying with the requirements of the laws and requirements and controlling an even brightness of each light bulb module while maintaining the existing function of a protection circuit.
It is a primary objective of the present invention to provide an improved brightness control apparatus of a light bulb module, and the apparatus makes the improvement by using a signal receiving circuit and an amplification circuit to replace a portion of a brightness control apparatus of an existing light bulb module, so that the apparatus not only can adjust the brightness of the light bulb module by the remote control, but also can maintain an even brightness of each light bulb of the light bulb module and a total power consumption of the light bulb module in compliance with the requirements of local laws and regulations for the total normal rated power of the illumination equipments.
Another objective of the present invention is to install a failure protection circuit to the control circuit, so that if the control circuit of the light bulb module fails, each light bulb of the light bulb module remains lit.
To achieve the foregoing objectives, the present invention provides an improved brightness control apparatus, comprising:
a microcontroller, having a power pin, a ground pin and a plurality of pins;
a capacitance step-down rectification circuit, for converting an external alternate current (AC) into a direct current (DC), and supplying the direct current to an overall circuit system for its use;
an output control circuit, for receiving a control signal transmitted from the microcontroller, and controlling a total power consumption of the light bulb of the light bulb module; characterized in that
a signal receiving circuit is provided for receiving a phase angle of a received voltage and a current conduction status; and
an amplification circuit includes a terminal electrically coupled to the output control circuit for detecting the total power consumption of the light bulb module, and another terminal electrically coupled to the microcontroller.
In FIG. 1 , a preferred embodiment is provided for illustrating the present invention, and it is noteworthy to point out that the preferred embodiment is provided for the purpose of illustration only, but not intended to limit the scope of the invention.
In the preferred embodiment, a brightness control apparatus of a light bulb module comprises the following elements:
A microcontroller 1, which is a microcontroller of Model No. PIC12F510 produced by Microchip Company in this embodiment, includes a power pin 11, a first pin 12, a second pin 13, a third pin 14, a fourth pin 15, a fifth pin 16, a sixth pin 17 and a ground pin 18, and the second pin 13 is in a floating connection while it is not in use.
A capacitance step-down rectification circuit 21 is equipped with a plurality of resistors, a plurality of capacitors, a plurality of diodes, a Zener diode, a surge absorber, a 5-volt regulator IC and a 12-volt regulator IC, for converting an external AC power supply 3 into a DC power, and supplying the DC power to the whole circuit system for its use, and the capacitance step-down rectification circuit 21 is electrically coupled to the power pin 11 of the microcontroller 1.
An output control circuit 22 is equipped with an AC gate, a plurality of resistors and a capacitor. The output control circuit 22 further includes a current output terminal 221 electrically coupled to the light bulb module 5, and the output control circuit 22 is electrically coupled to the fourth pin 15 of the microcontroller 1 for receiving a control signal transmitted from the microcontroller 1.
A signal receiving circuit 23 is equipped with a plurality of resistors and electrically coupled to the third pin 14 and the fifth pin 16 of the microcontroller 1, and the signal receiving circuit 23 is provided for receiving a phase angle of the voltage of the current circuit and a conduction status of the current input terminal 231 or the current output terminal 221, and the current input terminal 231 is electrically coupled to two pins 211 of the power input terminal 3 of the capacitance step-down rectification circuit 21.
An amplification circuit 24 is equipped with an operational amplifier, a plurality of resistors and a plurality of capacitors. A terminal of the amplification circuit 24 is electrically coupled to the output control circuit 23, and another terminal of the amplification circuit 24 is electrically coupled to the sixth pin 17 of the microcontroller 1.
A failure protection circuit 25 is equipped with a relay, a transistor, a diode and a resistor, such that if any circuit of the output control circuit 22, the signal receiving circuit 23 or the amplification circuit 24 fails, the power input terminal 3 directly outputs power to the light bulb module 5, and the failure protection circuit 25 is electrically coupled to the second pin 13 of the microcontroller 1.
When the present invention is applied to a lamp as shown in FIG. 1 , the improvement resides on that the light bulb module 5 of the lamp includes three light bulbs 51 with the power of 70 W each, and users can install the brightness control apparatus of the invention to the lamp, so that the setup and control of the microcontroller 1 and the control of the aforementioned five control circuits can detect the quantity of light bulbs 51 of the light bulb module 5 and determine the voltage by the microcontroller 1 by the amplification circuit 24, and maintain the power between the current input terminal 231 and the current output terminal 221 at a standard normal rated power below 190 watts. Each light bulb 51 of the light bulb module 5 emits light with an even brightness by 63 watt.
Unlike the traditional brightness control apparatus of a light bulb module, the improved control circuit of the invention is connected to an external radio frequency remote control device by a BLUE-terminal 232 of the signal receiving circuit 23 for transmitting a radio frequency signal to the microcontroller 1 to control the brightness of the light bulbs 51 of the light bulb module 5, while controlling the power below the standard normal rated power of 190 watts. If a L-terminal 233 of the signal receiving circuit is coupled to the current input terminal 231, the cost for the required circuits will be lower, and the execution procedure and coding of the program for the microcontroller 1 will be simpler and easier.
The failure protection circuit 25 of the improved control circuit is provided for outputting power directly from the power input terminal to the light bulb module through the failure protection circuit if any one of the output control circuit 22, the signal receiving circuit 23 and the amplification circuit 24 fails, such that the light bulb module 5 remains lit, even if the control circuit fails. A lamp of this sort can maintain the required illumination without losing the overall aesthetic look of the lamp. Further, no change of the design is involved to comply with the total standard normal rated power for the illumination equipments, and thus the invention can save cost.
In summation of the description above, the present invention has the advantage of maintaining an even brightness of each light bulb of the light bulb module by the control of the brightness control apparatus, so that the brightness of the bulbs of the light bulb module will not be too dark or not lit. Further, the brightness control apparatus can operate with an external radio frequency remote control device to facilitate the control of brightness, and the failure protection circuit can maintain a temporary illumination effect and an overall aesthetic look of the lamp. If the brightness control circuit is operated normally, the total power consumption of the light bulbs of the light bulb module can meet the requirements of the standard normal rated power specified by local laws and regulations of the illumination equipments.
Claims (7)
1. An improved brightness control apparatus of a light bulb module, comprising:
a microcontroller, having a power pin, a ground pin and a plurality of pins;
a capacitance step-down rectification circuit, for converting an external alternate current into a direct current, and supplying said direct current for the use of an overall circuit system;
an output control circuit, for receiving a control signal transmitted from said microcontroller, and controlling a total power consumption of said light bulb of said light bulb module, characterized in that a signal receiving circuit is provided for receiving a phase angle of a received voltage and a current conduction status;
an amplification circuit includes a terminal electrically coupled to said output control circuit for detecting the total power consumption of said light bulb module, and another terminal electrically coupled to said microcontroller; and
a failure protection circuit installed between said light bulb module and said amplification circuit, for preventing an output from said power input terminal to said failure protection circuit when any one of said output control circuit, said signal receiving circuit and said amplification circuit fails, and said failure protection circuit is electrically coupled to said microcontroller.
2. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said signal receiving circuit operates with an external radio frequency remote control device for controlling a current conduction status of said light bulb module current.
3. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said voltage step-down circuit is equipped with a plurality of resistors, a plurality of capacitors, a plurality of diodes, a Zener diode, a surge absorber, a 5-volt regulator IC and a 12-volt regulator IC.
4. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said output control circuit is equipped with an AC gate, a plurality of resistors and a capacitor.
5. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said signal receiving circuit is equipped with a plurality of resistors.
6. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said amplification circuit is equipped with an operational amplifier, a plurality of resistors and a plurality of capacitors.
7. The improved brightness control apparatus of a light bulb module as recited in claim 1 , wherein said failure protection circuit is equipped with a relay, a transistor, a diode and a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/073,799 US7656098B2 (en) | 2008-03-10 | 2008-03-10 | Brightness control apparatus of light bulb module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/073,799 US7656098B2 (en) | 2008-03-10 | 2008-03-10 | Brightness control apparatus of light bulb module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20090224687A1 US20090224687A1 (en) | 2009-09-10 |
| US7656098B2 true US7656098B2 (en) | 2010-02-02 |
Family
ID=41052911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US12/073,799 Expired - Fee Related US7656098B2 (en) | 2008-03-10 | 2008-03-10 | Brightness control apparatus of light bulb module |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US7656098B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140320026A1 (en) * | 2013-04-24 | 2014-10-30 | Hon Hai Precision Industry Co., Ltd. | Lighting device |
| US9320112B2 (en) | 2012-04-02 | 2016-04-19 | Kent Tabor | Control system for lighting assembly |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102869158A (en) * | 2012-09-10 | 2013-01-09 | 国家电网公司 | Lamp energy-saving control device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513239A (en) * | 1982-03-09 | 1985-04-23 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for controlling a charging generator |
| US6339298B1 (en) * | 2000-05-15 | 2002-01-15 | General Electric Company | Dimming ballast resonant feedback circuit |
| US20020113555A1 (en) * | 1997-08-26 | 2002-08-22 | Color Kinetics, Inc. | Lighting entertainment system |
| US6724157B2 (en) * | 2001-11-14 | 2004-04-20 | Astral Communications Inc. | Energy savings device and method for a resistive and/or an inductive load |
| US7301290B1 (en) | 2007-02-23 | 2007-11-27 | Ming-Chi Tseng | Brightness control device of light bulb module |
| US20080074058A1 (en) * | 2006-09-26 | 2008-03-27 | Beyond Innovation Technology Co., Ltd. | Dc/dc converter and controller thereof |
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
-
2008
- 2008-03-10 US US12/073,799 patent/US7656098B2/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4513239A (en) * | 1982-03-09 | 1985-04-23 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for controlling a charging generator |
| US20020113555A1 (en) * | 1997-08-26 | 2002-08-22 | Color Kinetics, Inc. | Lighting entertainment system |
| US6339298B1 (en) * | 2000-05-15 | 2002-01-15 | General Electric Company | Dimming ballast resonant feedback circuit |
| US6724157B2 (en) * | 2001-11-14 | 2004-04-20 | Astral Communications Inc. | Energy savings device and method for a resistive and/or an inductive load |
| US20080074058A1 (en) * | 2006-09-26 | 2008-03-27 | Beyond Innovation Technology Co., Ltd. | Dc/dc converter and controller thereof |
| US20080180037A1 (en) * | 2007-01-29 | 2008-07-31 | Empower Electronics, Inc | Electronic ballasts for lighting systems |
| US7301290B1 (en) | 2007-02-23 | 2007-11-27 | Ming-Chi Tseng | Brightness control device of light bulb module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9320112B2 (en) | 2012-04-02 | 2016-04-19 | Kent Tabor | Control system for lighting assembly |
| US20140320026A1 (en) * | 2013-04-24 | 2014-10-30 | Hon Hai Precision Industry Co., Ltd. | Lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20090224687A1 (en) | 2009-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9392671B2 (en) | Lamp controller with extended life | |
| US20110291571A1 (en) | Intelligent energy-saving lamp | |
| US20140239821A1 (en) | Occupancy sensor with modular disconnect | |
| US7656098B2 (en) | Brightness control apparatus of light bulb module | |
| US8797696B2 (en) | Current leakage protection circuit, power socket and electronic device using same | |
| US20090322232A1 (en) | Brightness-ajustable illumination device and illumination system using the same | |
| US10390394B2 (en) | Solid-state lighting with an interface between an internal control voltage and an external voltage | |
| US10314136B2 (en) | Traffic light driving control circuit | |
| US20200375000A1 (en) | Photocontroller to control operation of a luminaire having a dimming line | |
| CN103281821B (en) | Grid power blackout or artificial switch circuit breaking intelligent recognition power | |
| KR100706037B1 (en) | LEDLight Emitting Diode signal lamp control unit | |
| KR101164049B1 (en) | The module of led dimming with cds sensor | |
| CN203352860U (en) | Intelligent identification power supply during power grid blackout or artificial-switching power-off | |
| KR101474075B1 (en) | Light emitting diodes drivinig apparatus | |
| CN106992501B (en) | Direct-current power supply capable of preventing power supply from being connected by mistake in output and LED lamp and control system thereof | |
| US11271388B2 (en) | Solid-state lighting with auto-tests and responses | |
| US9578717B2 (en) | Monitoring and control device and method for an illumination apparatus | |
| US20150137690A1 (en) | Power supply module for energy saving lamp | |
| US20080232016A1 (en) | Power control circuit with alarm | |
| KR20180069373A (en) | Smart led lighting apparatus using constant current type smps and control method thereof | |
| CN202949594U (en) | Dimming system of light-emitting diode (LED) lamp | |
| CN205726528U (en) | Infrared induction PWM dims LED lamp power supply | |
| EP3772047B1 (en) | A sensor | |
| CN110557863A (en) | LED street lamp control system and method thereof | |
| CN104701809A (en) | LED constant-voltage power supply with self-locking protecting circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| REMI | Maintenance fee reminder mailed | ||
| LAPS | Lapse for failure to pay maintenance fees | ||
| STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
| FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20140202 |